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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 49 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Half of 26 =
  2. 2.Half of 54 =
  3. 3.Half of 42 =
  4. 4.Double 85 =
  5. 5.Double 71 =
  6. 6.Double 58 =
  7. 7.Double 21 =
  8. 8.Double 55 =
  9. 9.Double 75 =
  10. 10.Half of 130 =
  11. 11.Half of 142 =
  12. 12.Half of 196 =
  13. 13.Double 52 =
  14. 14.Half of 44 =
  15. 15.Half of 66 =
  16. 16.Double 23 =
  17. 17.Double 59 =
  18. 18.Half of 68 =
  19. 19.Half of 134 =
  20. 20.Double 68 =
  21. 21.Double 78 =
  22. 22.Half of 100 =
  23. 23.Half of 194 =
  24. 24.Half of 50 =
  25. 25.Half of 180 =
  26. 26.Half of 168 =
  27. 27.Double 38 =
  28. 28.Half of 198 =
  29. 29.Half of 148 =
  30. 30.Double 56 =
  31. 31.Double 81 =
  32. 32.Half of 70 =
  33. 33.Half of 30 =
  34. 34.Double 98 =
  35. 35.Double 91 =
  36. 36.Double 49 =
  37. 37.Double 18 =
  38. 38.Double 26 =
  39. 39.Double 63 =
  40. 40.Double 22 =

Answer key

  1. 13
  2. 27
  3. 21
  4. 170
  5. 142
  6. 116
  7. 42
  8. 110
  9. 150
  10. 65
  11. 71
  12. 98
  13. 104
  14. 22
  15. 33
  16. 46
  17. 118
  18. 34
  19. 67
  20. 136
  21. 156
  22. 50
  23. 97
  24. 25
  25. 90
  26. 84
  27. 76
  28. 99
  29. 74
  30. 112
  31. 162
  32. 35
  33. 15
  34. 196
  35. 182
  36. 98
  37. 36
  38. 52
  39. 126
  40. 44

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